Question

What is the measure of Angle 1 in the figure below?

Answer 1

Find internal, then external angle.

Then

Internal Angle = 180° -78° - 37° = 65°

and

External angle <1 = 180° - 65°

. = 115°

(2 Neighbor angles sum up 180°)

Then answer is

OPTION D) 115°

.